Bi_2O_3对锂镁铝硅微晶玻璃结构与性能的影响研究

Bi2O3能够有效降低基础玻璃的熔化温度,在锂镁铝硅系统微晶玻璃中加入不同质量含量的Bi2O3后,采用DSC,XRD,FESEM以及高分辨透射电镜等测试手段进一步研究了Bi2O3对微晶玻璃结构及性能的影响。研究结果显示,微晶玻璃中析出的主要晶相为β-锂辉石和锂辉石固溶体,加入量为质量分数1.0%时,能够降低微晶玻璃晶化温度约25℃。Bi2O3质量含量为1.0%时微晶玻璃的热膨胀系数最小,但是微晶玻璃的抗折强度与Bi2O3的含量没有明显的线性关系,随着Bi2O3含量的增加,晶粒的尺寸呈现变小的趋势。     

锂铝硼硅微晶玻璃热处理制度的优化设计

采用差热分析(DTA) ,X衍射分析(XRD) ,扫描电镜分析(SEM )等分析手段研究热处理制度对锂铝硼硅微晶玻璃热膨胀系数的影响,并主要通过正交试验分析热处理过程中各因素对热膨胀系数的影响。得到影响因素的主次顺序为:晶化温度>核化时间>核化温度>晶化时间,并得出较好的热处理工艺条件:核化温度72 0℃、核化时间90min、晶化温度810℃、晶化时间16 0min ,为该晶系微晶玻璃的研究提供有益的参考。     

超低膨胀锂铝硅透明微晶玻璃热处理制度的研究

通过差热分析和测定昌化热处理过程中密度变化的方法来研究超代膨胀锂铝硅透明微晶玻璃的晶化热处理制度，并用传统的正交试验方法进行验主下，研究结果表明，这种方法能准确、方便地确定锂铝硅透明微晶玻璃的晶化热处理制度。本微晶玻璃的最佳热处理条件为：700℃核化3小时，780℃晶化2小时，所得透明微晶玻璃的热膨胀系数为0.9×10^-7/℃，抗热震性为762℃。     

热处理制度对Li2O—Al2O3—SiO2系统微晶玻璃结构及性能的影响

结合ＸＲＤ、ＳＥＭ和热膨胀系数的测定,确定了较合适的热处理方法,并研究了热处理制度对Ｌｉ２Ｏ－Ａｌ２Ｏ３－ＳｉＯ２系统微晶玻璃的结构及性能的影响,同时理论结合实际分析了影响透明微晶玻璃强度的因素。     

二硅酸锂微晶玻璃结构调控及性能

通过熔融-热处理法制备了不同硅锂比(SiO_2与Li_2O摩尔比)的二硅酸锂微晶玻璃,利用XRD、DTA和SEM对微晶玻璃的微观结构形貌进行了表征,研究了硅锂比和热处理温度制度对二硅酸锂微晶玻璃的晶相组成、晶粒大小以及断裂强度的影响。结果表明,较低的硅锂比(SiO_2与Li_2O摩尔比为2.109)会促使六边形的偏硅酸锂主晶相形成;而较高的硅锂比(SiO_2与Li_2O摩尔比为2.469)则会促使形成二硅酸锂主晶相,微观形貌为棒状晶粒的互锁结构。由于二硅酸锂棒状晶体的形成,微晶玻璃在恰当的热处理制度下可以达到较高的断裂强度。     

Li2O-Al2O3-SiO2系统低膨胀微晶玻璃性能研究

Li2O-Al2O3-SiO2系统微晶玻璃是一种具有耐高温、耐热冲击、热膨胀系数低等性能的新型玻璃材料,受到科研人员的广泛关注.通过改变Li2O-Al2O3-SiO2系统微晶玻璃的基础配方以及热处理制度,制备了具有较低热膨胀系数的Li2O-Al2O3-SiO2系统微晶玻璃.结合运用差热热重、X射线衍射、扫描电镜等测试分析方法,研究性能与其组分、微观结构和热处理制度之间的相互联系.结果表明:通过对热处理制度的调整,促进了玻璃的析晶过程,核化温度和晶化温度有所降低.玻璃析出的主晶相为LiXAlXSi1-XO2,最低热膨胀系数达到25.365×10-7℃-1.     

添加Cr2O3的PbO—ZnO—B2O3—SiO2系统微晶玻璃的研究

运用差热分析，Ｘ射线衍射分析，扫描电镜及透射电镜观察，红外光谱测试及拉曼散射光谱等多种方法，对添加Ｃｒ２Ｏ３的ＰｂＯ－ＺｎＯ－Ｂ２Ｏ３－ＳｉＯ２系统微晶玻璃进行了研究，得出了Ｃｒ２Ｏ３做为典型的晶核剂，用来诱导和控制晶化过程是最佳选择的结论，探讨了基础玻璃配方，Ｃｒ２Ｏ３的加入量及热处理制度的确定等问题。     

热处理制度对Li2O-Al2O3-SiO2 系统微晶玻璃结构及性能的影响

结合ＸＲＤ、ＳＥＭ 和热膨胀系数的测定,确定了较合适的热处理方法,并研究了热处理制度对Ｌｉ２Ｏ－Ａｌ２Ｏ３ －ＳｉＯ２系统微晶玻璃的结构及性能的影响,同时理论结合实际分析了影响透明微晶玻璃强度的因素。     

Li2O—Al2O3—SiO2系统光敏微晶玻璃的低温热处理

主要研究和探讨了Ｌｉ２Ｏ－Ａｌ２Ｏ３－ＳｉＯ２系统光敏微晶玻璃热处理制度及曝光时间对其析晶晶相及其在氢氟酸中侵蚀的作用和影响，并通过Ｘ衍射等手段分析研究了其低温析晶晶相。     

THE STRUCTURE AND PROPERTIES OF Li2O-Al2O3-SiO2 LOW EXPANSION GLASS CERAMICS CONTAINING B2O3

Through measuring the coefficient of linear expansion, the structure and properties of the Li2O-Al2O3-SiO2 low expansion glass ceramics containing B2O3 are studied by JR and XRD. It is shoutn that the IR method is efficient in the study of the glass-ceramics structure. There is a " Boron abnormality" in the system which has an important influence on the properties of the glass-ceramics.     

SrO-Al2O3-SiO2系统微晶玻璃的晶化行为及性能

通过改变玻璃成分,在不同的热处理制度下制备SrO-Al2O3-SiO2系统微晶玻璃,用DTA、XRD、SEM等手段对该系统微晶玻璃材料的析晶过程进行了研究。在此基础上,讨论了晶化行为对微晶玻璃的热学及力学性能的影响。结果表明:材料的热学性能及力学性能与玻璃成分及热处理制度密切相关。可以找到某一确定组分的基础玻璃,经过较低的核化温度与较高晶化温度热处理后,能够得到力学性能优良、热学性能较好的微晶玻璃材料。     

Effects of heat treatment temperature on crystallization and thermal expansion coefficient of Li_2O-Al_2O_3-SiO_2

The basic glass of Li2 O-Al2 O3-SiO2 system using P2O5 as nucleator was prepared by means of conventional melt quenching technology, and the heat-treatment process was determined by using differential thermal analysis. The crystalline phases and the microstructure of the glass-ceramics were investigated by using X-ray diffraction and scanning electron microscopy. The results show that the glass based on Li2 O-Al2 O3-SiO2 oxides using P2 O5 as nucleator can be prepared at lower melt temperature of 1 450 ℃ and the glass-ceramics with lower thermal expansion coefficient of 21.6 × 10-7 ℃ 1 can also be obtained at 750 ℃. The glass-ceramics contain a few crystal phases in which the main crystal phase is β-quartz solid solution and the second crystal phase is β-spodumene solid solution. When the heat treatment temperature is not higher than 650 ℃, the transparent glass-ceramics containing β-quartzsolid solution can be prepared. β-quartz solid solution changes into β-spodumene solid solution at about 750 ℃. And the appearance of the glass-ceramics changes from translucent, part opaque to complete opaque with increasing temperature.     

Li2O-B2O3-SiO2系统微晶玻璃制备及晶化机制

采用传统的熔融后冷却并恒温热处理的方法可获得组成为(1-x) Li2O·2B2O3·xSiO2 (x=0,0.05,0.1,0.15,0.2)的微晶玻璃,利用TDA,XRD,SEM及IR等测试方法研究了其显微组织结构.结果表明,在热处理过程中,表面晶化占主导地位,晶化过程由内部定向进行;SiO2的加入有利于晶相向Li2B4O7转化;结晶厚度、晶粒尺寸、与玻璃组成、热历史、表面状态、热处理制度及内部物质的扩散等因素有关.     

Li2O-B2O3-SiO2系电绝缘封接玻璃的研制

以Li2O-B2O3-SiO2系统为基础,添加少量外加剂,制备了结晶型电绝缘封接玻璃.测试表明,该电绝缘封接玻璃在540℃以下是电绝缘的,其热膨胀系数为109×10-7℃-1,主晶相为Li2O·SiO2.     

Thermal behavior and lithium ion conductivity of L2O-Al2O3-TiO2-SiO2-P2O5 glass-ceramics

A lithium ion conductive solid electrolyte, L2O-Al2O3-TiO2-SiO2-P2O5 glass with NASICON-type structure have been synthesized and transformed into glass-ceramic through thermal-treatment at various temperatures from 700 to 1 000 ℃ for 12 h. The differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and complex impedance techniques were employed to characterize the samples. The experimental results indicated that the capability of glass forming in this system is superior to that of L2O-Al2O3-TiO2-P2O5. The glass has an amorphous structure and resultant glass-ceramic mainly consisting of LiTi2(PO4)3 phases. Impurity phases AlPO4, TiO2, TiP2O7 and unidentified phase were observed. With the enhanced heat-treatment temperature, grain grew gradually and lithium ion conductivity of glass-ceramics increased accordingly, the related impedance semicircles were depressed gradually and even disappeared, which could be analytically explained by the coordinate action of the ’Constant phase element’ (CPE) model and the ’Concept of Mismatch and Relaxation’ model (CMR). When the sample is devitrified at 1 000 ℃, the maximum room temperature lithium ion conductivity comes up to 4.1×10-4 S/cm, which is suitable for the application as an electrolyte of all-solid-state lithium batteries.     

B_2O_3对硼硅酸盐玻璃结构和性能的影响

硼硅酸盐玻璃与普通的钠钙硅玻璃相比,性能上有非常明显的优势。主要探讨B2O3对硼硅酸盐玻璃结构和性能的影响。通过红外光谱和拉曼光谱分析了硼硅酸盐玻璃在不同含量B2O3的情况下的结构变化,测试了玻璃的热膨胀系数、转变温度、软化温度和化学稳定性。研究结果表明:随着B2O3含量的增加,玻璃结构中[BO3]增多,[BO4]先增多后相当,玻璃的热膨胀系数也是先减小后增大,转变温度和软化温度都逐渐减小;硼硅酸盐玻璃中加入适量的B2O3后对玻璃的化学稳定性有一定的改善。     

MgO-Al2O3-SiO2系统微晶玻璃晶化行为研究

利用X射线衍射和扫描电镜研究MgO-Al2O3-SiO2系统微晶玻璃的晶化行为.结果表明,TiO2质量分数少于6%的玻璃,最先析出的是μ-堇青石,最终主晶相是α-堇青石,玻璃为表面析晶.TiO2质量分数为6%的玻璃,最先析出的是镁铝钛酸盐(MAT),最终主晶相是α-堇青石,玻璃为整体析晶.在950℃时开始检测到含锆相,在950~1100℃范围内表现为ZrO2/TiO2固溶体形式.X射线衍射没有检测到其他含锆相.晶核剂TiO2和ZrO2是通过分相而影响玻璃晶化的,但ZrO2促进分相的能力略低于TiO2.     

Effect of the Cool System on Internal Stress of CaO-Al_2O_3-SiO_2 Glass-ceramic System

The samples were attained through altering the cooling system of producing glass-ceramics. The X-ray diffraction was used to test the stress value of different samples.The relation of the cooling system and internal stress were also investigated.The experimental results show that the stress of glass-ceramic had a close relation with starting cool temperature.Above 800℃,glass-ceramic could be accelerated cooling and did not bring stress.Temperature between 500℃and 800℃was an important temperature range of the formation of stress in glass-ceramic,in which the glass-ceramic stress would change obviously.Cool system was the key on how to control and eliminate internal stress in order to reduce the destroy of materials crated by internal stress.In addition,glass particles size increase,glass-ceramic stress increase in consequent.